Centrifugal fan-wheel.



W. El. ALLINGTON. CENTRIFUGAL FAN WHEEL. APQLIGATIU'N FILED SEPT.7,1909.

4Patented May 7,1912".

'STATES' PATENT .onirica WILLIAM E. ALLING'IQN, or sAGINW' MICHIGAN.

CENTRIFUGAL FN-WHEEL- Specification of Letters *Patent Patented May "7, 1912.

Application tiled September 7, 1909. A SerlNo. 516,317.

To aZ irh'o-m' ,it maywonccm Be it knoyygil-tthat I. Klimaat E. ALLING- rox, a citizen ofthe United Statesresiding at Saginaw, in the county of Saginaw and v{State of Michigan, have invented certain new and iisefulImprovements in Centrifw' gal Fan-lVheels,of whichthe following' is, a specification.

My inventionrelates to-improvements in centrifugal fan-wheels and more particularly-to` fan-wheels of the general type' illus- .trated-in iny prior Patent'No. 865,962, v i *j @neef the-salient objects is to provide a ffa'navheel construction .of-a. type embodying blades, each' free throughout its adjacent fan-inlet, all connected with aback plate at their-back. edges, and separately supported upon independentarlns connected with .their radial'miusportionand with the hub, which shall 'be especially adapted-for. the handling as is of shaving and -st-ringyv material surgi s upon' apt, if opportunity be'offered, to ma 'any exposed edge of the wheel structure'and destroy the balance' of the fan-wheel.

'erally in .side elevation, .with-parts broken construction shown in v Fig. 1.

which are secured radial arms, 12, one for. 40.- i 4"face a blade, 13, in arrangement such that 'the arniis attached to the blade at approxiawayfin different degrees, illustrating a fan-.wheell embodying my. invention; and

FigfQ is a-view, partly in'. elevation and each blade, and having secured to its front tely 'its transverse mid-portion. The lrear e ge of each blade adjacent the -rear wall of thel lcasing 'is inclined, as at 14, from the vmedian point of juncture with the arm', 12,.v

and 'thence'.fextends in parallelism to the b'ack wall .of the casing, or is straight in elevation, .as-Ih will term it, as shown'at 15. Each blade, however, is preferably given a forward pitch' .adjacent its outer edgecor tipi4 Thesev blades 1 3, entirely free along y their faces. adjacent the front 'wall -of the fcasing, .a're riveted or otherwisesiutably secured, -as at 1-6, to the back plate,--17,` of arr- Y .inular planar. configuratinligpfferablv sub- In the drawings'I Figure 1y is. avview, gen.- A

stantially as shownin my prior patent. In

practice, hoiveyer, I have found that, with l the constructions thus-far describethstringy material, such asjcot-ton, waste, rags, longV shavings, and the like, are apt'toiengagethe radially inner edge of the-planar annulus, 17,- constituting the back plate of the fanwheel. and, accumulating' thereon, will unbalancethe wheel to a'degree lwhich makes its operation imperfect. For this reason, I

)rovide a fuardconstruction'19 in the form of a truncatedcone to 'deflect the stringv.

material which' wouldotherwise be likely 4to catchupon the edge of the platev 17'. It

is of course desirable to keep the thin blades of the f. 'upon the r' narrower tapering portions, and

since the 'guard must be securely attached' owing to the impin'gement thereagainst-.of

thel stringy material which ity is todetlect asstrong as possible,4 especially.,

from the plate 17, the attachino' ineansmust be relatively strong, and if re'ctly' to the thin blades would require perfoi rat-ion thereof in a number of places, besides involving brackets or like parts upon the blades which would impede the ready slipvping of the material from theblades'. Since my prior device which I now improve is already provided with the plate 17 secured tothe blades-r` I 'utilize this plate to avoid the disadvantages laris'in'g'- out of attachnient of the guard-to the blades.A Thus, I

advantageously obtain the desired ends by.

providing upon the guard a base flange 20, shaped to extend around the edge of the plate 17 and lie in contact'with the bac-k I surface thereof, said flange being riveted orotherivise 'secured,.asat 21, to the plate,

and said con'oidal guard wall lextending from' such -point of engagement with the guard inward into close or substantially `contacting proximityto4 the disk 1 1 lout preferably free therefrom. Bythis simple arrangement, -the faults of my` prior device in handlingcertain vkinds of'material maybecheafply, eas-ily, and quickly cured bythe" gu-ard without touching for, imposing new strains upon'the blades. What I claiini's:`

4 `1. In afan-wheel the combination with radial arms, a central supporting disk, la plu-A "i'ralityJ of 4blades-,carried by said arms, the

ledgee-"o-f each sloping transversely from its` arm at both edges, free .at its front edge and 4having a portion vlsubstantially straight in 4face elevation bevond its sloping .partl'on'itsrear edge; of aba-ck plate secured to said 10 1 .plurality of blades carried 4by said arm, the

parts.

straight portions ofthe several blades, and a conoidal guard wall extending from said bank, plate to thedisk and substantially conforming'to the zslopeofthe backr edges ofthe '-bla'des and4 free therefrom,fthe-disk, backplate, and guard being 'structurally separate 2. rIn a `fan Wheel thel combination with radial. arms, a central .supporting disk, a

edge of each sloping` fromI its arm in 'a rea'rwar'd direction and having a portion substantially lstraight in face lelevation beyond' said sloping part; of a back plate s'ecured to .said straight portionsv of the several blades; and a'conoidal guard wall, secured to said' back plate and free from the blades and disks, extending from saidback plate `to the lblades and substantially' conforming 4 Vto the slopeof the back ledges of the blades.

3. 4 The combination With-a fan wheel hav- :in'g'a disk, a plurality of supporting arms,-a

blade vfor each arrn, the 'radially inner edge of each of said blades being inclined from its point of juncture with the supporting arm toward the front-.of the casing to permit the centrifugal'delivery of stringy material encountering the blade toward y the front side of'the Wheel, and. inclined froml such point of juncture with the supporting arm toward the back, whence the edge extends outwardly in a radial line, and an vannular plate connected to said blades at clined edges upon the annular plate.

In't-estimony .whereof I hereunto set my hand in the presence of two witnesses.

WILLAM E. ALL'INGTON;

In the presence of` lV. LINN ALLEN; MARY F. ALLEN. 

